// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_RENDERER_BROWSER_PLUGIN_BROWSER_PLUGIN_MANAGER_H_
#define CONTENT_RENDERER_BROWSER_PLUGIN_BROWSER_PLUGIN_MANAGER_H_

#include "base/id_map.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "content/public/renderer/render_thread_observer.h"
#include "ipc/ipc_sender.h"

namespace content {

class BrowserPlugin;
class BrowserPluginDelegate;
class RenderFrame;

// BrowserPluginManager manages the routing of messages to the appropriate
// BrowserPlugin object based on its instance ID. There is one BrowserPlugin
// for the RenderThread.
class CONTENT_EXPORT BrowserPluginManager : public RenderThreadObserver {
public:
    static BrowserPluginManager* Get();

    BrowserPluginManager();
    ~BrowserPluginManager() override;

    // Creates a new BrowserPlugin object.
    // BrowserPlugin is responsible for associating itself with the
    // BrowserPluginManager via AddBrowserPlugin. When it is destroyed, it is
    // responsible for removing its association via RemoveBrowserPlugin.
    // The |delegate| is expected to manage its own lifetime.
    // Generally BrowserPlugin calls DidDestroyElement() on the delegate and
    // right now the delegate destroys itself once it hears that callback.
    BrowserPlugin* CreateBrowserPlugin(
        RenderFrame* render_frame,
        const base::WeakPtr<BrowserPluginDelegate>& delegate);

    void Attach(int browser_plugin_instance_id);

    void Detach(int browser_plugin_instance_id);

    void AddBrowserPlugin(int browser_plugin_instance_id,
        BrowserPlugin* browser_plugin);
    void RemoveBrowserPlugin(int browser_plugin_instance_id);
    BrowserPlugin* GetBrowserPlugin(int browser_plugin_instance_id) const;

    void UpdateFocusState();

    // Returns a new instance ID to be used by BrowserPlugin. Instance IDs are
    // unique per process.
    int GetNextInstanceID();

    void DidCommitCompositorFrame(int render_frame_routing_id);
    bool Send(IPC::Message* msg);

    // RenderThreadObserver override.
    bool OnControlMessageReceived(const IPC::Message& message) override;

private:
    // This map is keyed by guest instance IDs.
    IDMap<BrowserPlugin*> instances_;

    DISALLOW_COPY_AND_ASSIGN(BrowserPluginManager);
};

} // namespace content

#endif // CONTENT_RENDERER_BROWSER_PLUGIN_BROWSER_PLUGIN_MANAGER_H_
